Answers

According to your description, you want to select column name in the parameter drop-down list, then use the corresponding field to filter the tablix.

After testing the issue in my environment, we can manually type the field name as the parameter available values, then use the parameter value as the field name to work around this issue. For more details, please refer to the following steps:

Create a parameter named column in the report.

Specify the field name as the Available Values:
Label : name Value: name
Label : salary Value: salary
Label : age Value: age

According to your description, you want to select column name in the parameter drop-down list, then use the corresponding field to filter the tablix.

After testing the issue in my environment, we can manually type the field name as the parameter available values, then use the parameter value as the field name to work around this issue. For more details, please refer to the following steps:

Create a parameter named column in the report.

Specify the field name as the Available Values:
Label : name Value: name
Label : salary Value: salary
Label : age Value: age